Volume 369, Number 3, April III 2001
|Page(s)||986 - 992|
|Section||Interstellar and circumstellar matter|
|Published online||15 April 2001|
CCD-based observations of PG 0856+121 and a theoretical analysis of its oscillation modes *
Universidade de Vigo, Departamento de Física Aplicada, Área de Física da Terra, Astronomía e Astrofísica, Facultade de Ciencias, Campus Lagoas-Marcosende, 36200 Vigo, Spain
2 Instituto de Astrofísica de Canarias, c/ Vía Láctea s/n, 38200 La Laguna, Tenerife, Spain
3 CALTECH, MS 150-21, Pasadena, CA 91125, USA
4 Departamento de Astrofísica, Universidad de La Laguna, Tenerife, Spain
5 Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA
Corresponding author: A. Ulla, firstname.lastname@example.org
Accepted: 29 January 2001
BVRI CCD-based and near-IR (J) imaging, together with unfiltered photometry of the hot subdwarf B star PG 0856+121, are reported. Two close, faint, red, point-like sources are resolved. They account for the previously reported IR excess observed in this hot subdwarf. In addition, the new unfiltered differential photometry of PG 0856+121 confirms its previously reported pulsational nature. A comparison with the oscillation modes of stellar models suggests the presence of g modes.
Key words: binaries: close / stars: individual: PG 0856+121 / stars: oscillations / subdwarfs
© ESO, 2001
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